Book excerpt: Carolyn Meyer, author of best-selling ROYAL DIARIES Isabel and Anastasia, now brings to the series this compelling story of Kristina, The Girl King, from 17th-century Sweden. Upon discovering that their newborn infant was, in fact, female and not male as first thought, Queen Marie Eleonore wailed inconsolably and King Gustavus Adolphus declared, nevertheless, that the child be raised as a prince. At age six, upon the death of her father, the child Kristina, was proclaimed King of Sweden, with regents assigned to council until she assumes the throne at age eighteen. And indeed, her life followed her father's plan. We meet Kristina when she's almost twelve years old and eschewing feminine practices but reveling in the study of military tactics,